Give reasons for the following:
$(a)$ Echidna and Platypus lay eggs but are considered as mammals.
$(b)$ Birds have pneumatic bones.
$(a)$ Echidna and Platypus lay eggs but are considered as mammals.
$(b)$ Birds have pneumatic bones.
(N/A) Echidna and Platypus are classified as mammals because they possess mammary glands to feed their young with milk,have hair on their bodies,and are warm-blooded (homeothermic),despite the fact that they lay eggs (oviparous).
$(b)$ Birds have pneumatic (hollow and air-filled) bones to reduce their body weight,which makes them light and facilitates flight.
$(b)$ Birds have pneumatic (hollow and air-filled) bones to reduce their body weight,which makes them light and facilitates flight.
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Similar Questions
Match the items of Column $(A)$ with the items of Column $(B)$:
Column $(A)$ Column $(B)$ $(a)$ Pore bearing animals $(A)$ Arthropoda $(b)$ Diploblastic $(B)$ Coelenterata $(c)$ Metameric segmentation $(C)$ Porifera $(d)$ Jointed legs $(D)$ Echinodermata $(e)$ Soft bodied animals $(E)$ Mollusca $(f)$ Spiny skinned animals $(F)$ Annelida
| Column $(A)$ | Column $(B)$ |
| $(a)$ Pore bearing animals | $(A)$ Arthropoda |
| $(b)$ Diploblastic | $(B)$ Coelenterata |
| $(c)$ Metameric segmentation | $(C)$ Porifera |
| $(d)$ Jointed legs | $(D)$ Echinodermata |
| $(e)$ Soft bodied animals | $(E)$ Mollusca |
| $(f)$ Spiny skinned animals | $(F)$ Annelida |
Easy
View SolutionClassify organisms of kingdom $Protista$ on the following basis and give an example of each:
$(a)$ Based on structure for locomotion.
$(b)$ Based on mode of nutrition.
$(a)$ Based on structure for locomotion.
$(b)$ Based on mode of nutrition.
Medium
View SolutionState whether the following statement is true or false:
Thallophytes are called the amphibians of the plant kingdom.
Thallophytes are called the amphibians of the plant kingdom.
Easy
View SolutionWhich of the following is not an Annelid?
Medium
View SolutionWho proposed the two kingdom classification?
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